Unlock instant, AI-driven research and patent intelligence for your innovation.

Vibration damping apparatus

a damping apparatus and vibration technology, applied in mechanical equipment, shock absorbers, transportation and packaging, etc., can solve the problems of unacceptably high vibration in the surrounding structure, vibration modes of mechanical vibrating systems employing such hydraulic damping apparatus

Active Publication Date: 2008-01-01
LEONARDO MW LTD
View PDF21 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This solution efficiently dampens vibrations at frequencies like the 4th and 6th harmonics, reducing overall system vibrations and protecting the damper from overload by simulating more compressible hydraulic fluid behavior.

Problems solved by technology

Mechanical vibrating systems employing such hydraulic damping apparatus may experience modes of vibration other than at a fundamental frequency which primarily it is desired to damp.
To damp such additional vibrations, may result in unacceptably high vibration being experienced in the surrounding structure.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Vibration damping apparatus
  • Vibration damping apparatus
  • Vibration damping apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022]In a vibrating system such as a helicopter rotor system (main sustaining or tail rotor) a first component such as a rotor blade, is mounted in use to a second component namely a rotor hub. Between each blade and the hub, a vibration damping apparatus is provided to damp vibrations arising in the dynamic system during rotor rotation, and particularly vibrations arising in the plane of rotation of the blades, as the blades experience forces which cause the blades to tend to move relative to the rotating rotor hub.

[0023]Referring to FIG. 1, in a typical arrangement the damping apparatus 10 includes a piston 11 carried on a piston rod 12, the piston rod 12 having at or adjacent one end thereof, a first attachment formation 15 by means of which the damping apparatus 10 is attached to the first component namely the helicopter blade.

[0024]The piston 11 is provided in a damping chamber 16 which has a second attachment formation 18 by means of which the damping apparatus 10 is attached...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A damping apparatus for damping vibrations in a vibrating system including a piston which is reciprocally movable in a hydraulic fluid filled damper chamber, piston movement in either direction of movement being resisted by fluid pressure in the damper chamber behind the piston, which resistance provides damping forces which act to oppose piston movement, the piston being connected to one component of the vibrating system and the damping chamber being connected to a second component of the vibrating system, characterised in that the fluid at at least a first side of the piston acts on a movable part which is movable in response to changing fluid pressure in the damper chamber at the first side of the piston as the piston moves, the movable member providing a relief volume for the fluid into which and from which fluid may flow from and towards the first side of the piston without passing to an opposite second side of the piston.

Description

BACKGROUND OF THE INVENTION[0001]This invention relates to a vibration damping apparatus for damping vibrations in a vibrating system.DESCRIPTION OF THE PRIOR ART[0002]Hydraulic dampers, are known for use in helicopter rotor systems for example, for damping helicopter blade movements in a plane of rotation as the blades rotate (so called “lead-lag dampers”), although similar hydraulic dampers are provided in other vibrating systems to damp vibrations.[0003]In one form of damping apparatus, the apparatus includes a piston movable in a chamber in response to vibrations, piston movement being resisted by hydraulic fluid pressure in the chamber at either side of the piston. Restricted fluid flow from one side of the piston to the other is permitted so that the piston may move in the chamber whilst providing damping forces to counteract such piston movements and provide damping.[0004]To prevent overload at high piston velocities it is known to incorporate into the damping apparatus a loa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): F16F9/46F16F5/00F16F9/096F16F9/20
CPCF16F5/00F16F9/096F16F9/20
Inventor MARTYN, GERALD HENRYLORD, ANDREW ALANBRODIE, REBECCA DIANA
Owner LEONARDO MW LTD